US3759795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calciner preheater
Assignee: Union Oil Company of California
•
Filing: 1971-07-15
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Granted: 1973-09-18
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Expires: 1991-07-15
Abstract
Abstract A METHOD IS DESCRIBED FOR PREHEATING COKE IN A CALCINING PROCESS TO A TEMPERATURE BETWEEN ABOUT 600* TO 1000* F., PREFERABLY TO BETWEEN 850* AND 1000*F. THIS PREHEATING AVOIDS SHATTERING OF THE COKE INTO UNDESIRABLE SMALL PARTICLES IN THE CALCINING KILN. THE HOT COMBUSTION GASES FROM THE KILN ARE ADMIXED WITH AIR TO BURN ALL VOLATILE COMBUSTIBLE MATERIAL CONTAINED IN THE GASES AND A PORTION OF THE RESULTANT HOT GASES IS ADMIXED WITH COOLER GAS TO OBTAIN A HEATING GAS FOR THE PREHEATER HAVING A TEMPERATURE BETWEEN ABOUT 800* AND 1250*F. THIS HEATING GAS IS SUPPLIED TO THE PREHEATER IN SUFFICIENT VOLUME TO PREHEAT THE COKE TO ABOVE ABOUT 600*F., PREFERABLY ABOVE 850*F.
Inventors
- 👤 R Oliver
- 👤 G Ford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:55
CPC Classifications
C; C10; C10B; C10B49/00; C10B49/02; C10B49/04; Y; Y02; Y02P; Y02P20/00; Y02P20/10; Y02P20/129
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |